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Stock-Based Compensation (Details 7) (USD $)	3 Months Ended
Stock-Based Compensation (Details 7) (USD $)	Mar. 31, 2013	Mar. 31, 2012
Stock-Based Compensation
Non-cash, stock-based compensation	$ 11,320,000	$ 23,182,000
Subscriber-related
Stock-Based Compensation
Non-cash, stock-based compensation	444,000	837,000
General and administrative
Stock-Based Compensation
Non-cash, stock-based compensation	10,876,000	22,345,000
Non-Performance Based Stock Awards
Share-based expenses
Unrecognized compensation expense	$ 18,000,000
Share-based compensation additional disclosures
Future forfeiture rate (as a percent)	4.30%
Weighted average period for recognition of compensation cost	2 years

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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